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3 years ago

Write two ways to group and add 4+7+2

Mathematics

1 answer:

saul85 [17]3 years ago

4 0

Answer:

Two ways you can group them is:

(4+7)+2

4+(7+2)

They will both give you the same answer of 13.

(4+7)+2 4+(7+2)

11+2= 13 4+9= 13

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An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California. Suppose that

sergiy2304 [10]

Answer:

(22.0297, 23.3703)

Step-by-step explanation:

Given that an economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California.

Let X be per capita income (in thousands of dollars) for a major city in California.

Mean = 22.7

n = 183

Population std dev = 6.3

Since population std dev is known we can use Z critical value.

Std error = $\frac{6.3}{\sqrt{183} } \\=0.4657$

Z critical =1.44

Marginof error = ±1.44*0.4657=0.6706

Confidence interval 85%

= $(22.7-0.6703, 22.7+0.6703)\\= (22.0297, 23.3703)$

7 0

2 years ago

Anne owns a used car lot and in order to get cars to sell, she buys used cars at an

azamat

Answer:

It would be 2,000x+200

Step-by-step explanation:

okay it costs $200 to attend so that's a cost you are going to have to pay regardless. The $2,000 depends on how many cars you buy. So it would be 2,000 (times how ever many cars you buy) plus the $200.

3 0

2 years ago

Plzz solve this easy calculus :')

Digiron [165]

Answer:

$\sin \: x - \cos x \: + c$

Step-by-step explanation:

$\int \frac{cos2x}{ \sqrt{1 - sin2x} } dx \\ \\ = \int \frac{ {cos}^{2}x - {sin}^{2}x } { \sqrt{ {sin}^{2}x + {cos}^{2}x - 2sinx \: cosx } } dx \\ \\ = \int \frac{ ({cos}x - {sin}x )({cos}x + {sin}x )} { \sqrt{ {({cos}x - {sin}x )}^{2} } } dx \\ \\ = \int \frac{ ({cos}x - {sin}x )({cos}x + {sin}x )} {{ {({cos}x - {sin}x )} } } dx \\ \\ = \int({cos}x + {sin}x)dx \\ \\ = \int{cos}x \: dx + \int{sin}x \: dx \\ \\ = \sin \: x - \cos x \: + c$

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2 years ago

Hours worked / pay

Nadusha1986 [10]

It is c because 8x2=16 and 8x4=32 and so on

7 0

3 years ago

Math question down below

Alja [10]

Answer:

E is the only one that ends with 70 and is also all multiples of 6.

4 0

3 years ago